Front light module

Abstract

A front light module, including: a light source; a light guide plate, having a first refractive index and having a side face neighboring the light source; a medium layer, placed over the light guide plate and having a second refractive index, wherein the second refractive index is smaller than the first refractive index; a transparent material layer, placed over the medium layer; and a transparent glue layer, placed under the light guide plate and having a third refractive index, wherein the third refractive index is larger than the refractive index of air and smaller than or equal to the first refractive index.

What is claimed is: 
     
       1. A front light module, comprising:
 a light source; 
 a light guide plate, having a first refractive index and having a side face neighboring said light source; 
 a medium layer, placed over said light guide plate and having a second refractive index, said medium layer prevents incident light beams of large angles of incidence from passing through a top face of said light guide plate, wherein said second refractive index is smaller than said first refractive index; 
 a transparent material layer, placed over said medium layer; and 
 a transparent glue layer, placed under said light guide plate and having a third refractive index, said transparent glue layer has a plurality of pillar structures, wherein said third refractive index is larger than the refractive index of air and smaller than or equal to said first refractive index; 
 wherein said medium layer is located above said light guide plate and said transparent glue is located below said light guide plate. 
 
     
     
       2. The front light module as  claim 1 , wherein said light source comprises lighting device selected from a group consisting of a fluorescent lamp and a LED. 
     
     
       3. The front light module as  claim 1 , wherein said light guide plate has a first pattern located on the top face. 
     
     
       4. The front light module as  claim 3 , wherein said first pattern includes a pattern selected from a group consisting of a plurality of V type microstructures and a plurality of diffusion points. 
     
     
       5. The front light module as  claim 3 , wherein said transparent glue layer has a second pattern including said plurality of pillar structures. 
     
     
       6. The front light module as  claim 5 , wherein an area of a top face of each pillar structure of said plurality of pillar structures varies with a distance between said pillar structure and said light source in a way that said area of each said pillar structure of said plurality of pillar structures becomes larger as said distance increases. 
     
     
       7. The front light module as  claim 5 , wherein a gap located between two neighboring pillar structures of said plurality of pillar structures varies with a distance between said gap and said light source in a way that said gap becomes smaller as said distance increases. 
     
     
       8. The front light module as  claim 5 , wherein said light guide plate has a third pattern including a plurality of extruding structures on the bottom face of said light guide plate, wherein said third pattern engages with said second pattern in a complementary manner. 
     
     
       9. The front light module as  claim 8 , wherein an area of a bottom face of each extruding structure of said plurality of extruding structures varies with a distance between said extruding structure and said light source in a way that said area of the bottom face of each said extruding structure of said plurality of extruding structures becomes smaller as said distance increases. 
     
     
       10. The front light module as  claim 8 , wherein an area of a top face of each pillar structure of said plurality of pillar structures varies with a distance between said pillar structure and said light source in a way that said area of each said pillar structure of said plurality of pillar structures becomes larger as said distance increases. 
     
     
       11. The front light module as  claim 8 , wherein a gap located between two neighboring pillar structures of said plurality of pillar structures varies with a distance between said gap and said light source in a way that said gap becomes smaller as said distance increases. 
     
     
       12. The front light module as  claim 1 , wherein said transparent material layer comprises glass. 
     
     
       13. The front light module as  claim 1 , wherein bottom faces of said plurality of pillar structures of said transparent glue layer are attached to an electronic paper device. 
     
     
       14. The front light module as  claim 13 , wherein said electronic paper device is a device selected from a group consisting of a reflective type display device and a transflective type display device. 
     
     
       15. The front light module as  claim 13 , wherein said electronic paper device is a device selected from the group consisting of electrophoresis display, MEMS (Micro Electro Mechanical System) display, cholesteric liquid crystal display, electrowetting display, liquid crystal display, organic/inorganic Electroluminescence display, and electrochromic display. 
     
     
       16. A front light module, comprising:
 a light source; 
 a light guide plate, having a first refractive index and having a side face neighboring said light source; 
 a medium layer, placed over said light guide plate and having a second refractive index, said medium layer prevents incident light beams of large angles of incidence from passing through a top face of said light guide plate, wherein said second refractive index is smaller than said first refractive index; 
 a transparent material layer, placed over said medium layer; and 
 a transparent glue layer, placed under said light guide plate and having a third refractive index, said transparent glue layer has a plurality of pillar structures, wherein said third refractive index is larger than the refractive index of air and smaller than or equal to said first refractive index, and bottom faces of said plurality of pillar structures of said transparent glue layer are attached to an electronic paper device; 
 wherein said medium layer is located above said light guide plate and said transparent glue is located below said light guide plate. 
 
     
     
       17. The front light module as  claim 16 , wherein said light guide plate has a first pattern located on the top face. 
     
     
       18. The front light module as  claim 17 , wherein said first pattern includes a pattern selected from a group consisting of a plurality of V type microstructures and a plurality of diffusion points. 
     
     
       19. The front light module as  claim 18 , wherein said transparent glue layer has a second pattern including said plurality of pillar structures. 
     
     
       20. The front light module as  claim 19 , wherein an area of a top face of each pillar structure of said plurality of pillar structures varies with a distance between said pillar structure and said light source in a way that said area of each said pillar structure of said plurality of pillar structures becomes larger as said distance increases. 
     
     
       21. The front light module as  claim 19 , wherein a gap located between two neighboring pillar structures of said plurality of pillar structures varies with a distance between said gap and said light source in a way that said gap becomes smaller as said distance increases. 
     
     
       22. The front light module as  claim 19 , wherein said light guide plate has a third pattern including a plurality of extruding structures on the bottom face, wherein said third pattern engages with said second pattern in a complementary manner. 
     
     
       23. The front light module as  claim 22 , wherein an area of a bottom face of each extruding structure of said plurality of extruding structures varies with a distance between said extruding structure and said light source in a way that said area of the bottom face of each said extruding structure of said plurality of extruding structures becomes smaller as said distance increases. 
     
     
       24. The front light module as  claim 22 , wherein an area of a top face of each pillar structure of said plurality of pillar structures varies with a distance between said pillar structure and said light source in a way that said area of each said pillar structure of said plurality of pillar structures becomes larger as said distance increases. 
     
     
       25. The front light module as  claim 22 , wherein a gap located between two neighboring pillar structures of said plurality of pillar structures varies with a distance between said gap and said light source in a way that said gap becomes smaller as said distance increases.